N-donor ligand driven CdII-based coordination polymers: Synthesis, structures and highly selective luminescence sensing for Fe3+ ions

Abstract Three Cd II -based coordination polymers (CPs), formulated as [Cd 2 (dnpdc) 3 (DMSO) 3 ·0.5H 2 O] n ( 1 ), [Cd(dnpdc)(bpee)] n ( 2 ) and {Cd(dnpdc)(bimb)·2H 2 O} n ( 3 ) have been successfully synthesized and structurally characterized. Compound 1 exhibits a 4-fold interpenetrated 3D diamond network based on dinuclear Cd 2 (OCO) 3 cluster. Compound 2 features 3D frameworks constructed from the 2D [Cd(dnpdc)] n sheets pillared by 1D zig-zag shaped [Cd(bpee)] n chains. In compound 3 , the mononuclear Cd II units are mixed connected by the dnpdc 2− and bimb ligands, yielding the 6-fold interpenetrated 3D diamond network. The fluorescence measurements reveal that three compounds exhibit intense blue emission in the solid state. In particular, compound 3 exhibits highly selective chemical sensing for Fe 3+ ions in aqueous solution.